The climate of Iceland's coast is subpolar oceanic. The warm North Atlantic Current ensures generally higher annual temperatures than in most places of similar latitude in the world. Regions in the world with similar climate include the Aleutian Islands, the Alaska Peninsula and Tierra del Fuego, although these regions are closer to the equator. Despite its proximity to the Arctic, the island's coasts remain ice-free through the winter. Ice incursions are rare, the last having occurred on the north coast in 1969.[40]

There are some variations in the climate between different parts of the island. Generally speaking, the south coast is warmer, wetter and windier than the north. The Central Highlands are the coldest part of the country. Low-lying inland areas in the north are the most arid. Snowfall in winter is more common in the north than the south.

The highest air temperature recorded was 30.5 °C (86.9 °F) on 22 June 1939 at Teigarhorn on the southeastern coast. The lowest was −38 °C (−36.4 °F) on 22 January 1918 at Grímsstaðir and Möðrudalur in the northeastern hinterland. The temperature records for Reykjavík are 26.2 °C (79.2 °F) on 30 July 2008, and −24.5 °C (−12.1 °F) on 21 January 1918.